Mortar for pulverizing-mills.



No. 876,812. v I I PATENTED JAN. 14, 1908.

' J. LAVAGNINO.

MORTAR POR PULVERIZING MILLS.

APPLICATION FILED JAN.17, 1907.

WI TNESSES IN VEN TOR I i h, M,

ATTORNEY.

THE NORRIS PETERS c0, WASHINGYON. 123a JOHN LAVAGNINO, OF IRVINE,CALIFORNIA.

MORTAR FOR PULVERIZING-MILLS.

Specification of Letters Patent.

Patented Jan; 14., 1908.

Application filed January 17, 1907- Serial No. 352.787.

To all whom it may concern:

Be it known that I, JOHN LAVAGNINO, a citizen of the United States, 1residing at Irvine, in the county of Oalaveras and State of California,have invented new and useful Improvements in Mortars for Pulverizing-Mills, of which the following is a specification.

This invention relates to improvements in mortars for pulverizing mills,the objects of the invention being to provide a mortar so constructedthat the screens thereof can be easily and quickly changed, and readilycleaned, and so that chips or other foreign material can be readilyremoved from the interior of the mortar.

My invention also resides in the novel construction, combination andarrangements of parts hereinafter fully specified and particu larlypointed out in the claims.

In the accompanying drawing, Figure 1 is a front view of the lowerportion of a stamp mill mortar constructed in accordance with myinvention, one of the screens being in po sition and the otherbeingremoved Fig. 2 is an enlarged vertical section of line 2-2 of Fig.1 Fig. 3 is a perspective view of a screen, detached; Fig. 4 is asimilar view of a gasket detached; Fig. 5 is a similar view of a screenplate, detached; Fig. 6 is a similar view of a screen frame box,detached.

Referring to-the drawing, 1 indicates the mortar of a stamp mill, thelower part only being here shown, said mortar having upwardly extendinggrooves 2 to receive keys 3, which secure in place a removable wall 4,which extends across the front of the mortar. On the lower portion ofsaid wall 4 are formed upwardly extending channels 6 and 7, the channelsat the sides being single, and the channel 6 at the middle being double.In these channels are received screen frames, each of which comprises arectangular box 8 in which the screen 9 is laid, a plate 10 laid oversaid screen in said box, and a gasket 11 of flexible material interposedbetween the screen and the box 8. Said box, gasket, and plate are eachformed with a rectangular central opening to allow the pulp to splashthrough the screen.

The channels 6 and 7 taper upwards in width, and the plates 10 arelikewise tapered or wedge-shaped, to make a tight fit for the screenframes in said channels. There is preferably provided a handle 12secured upon the top of each plate 10, for convenience in withdrawingthe frame from the channels, although this handle is not absolutelynecessary. There is also preferably provided a spring 13 which isattached to the removable wall 14., and the lower side of which isadapted to bear down upon the top of the screen frame, and hold it inposition by pressing the spring to one side, it can be removed fromengagement with the screen frame, whereupon the latter can be raised.

In order to permit of the ready removal of chips or other foreignsubstance from the interior of the mortar, there is formed in said wall4 an opening 14, which is colsed by a door 15 sliding in guideways 16.Upon said door and upon the wall 4 are secured posts 17 18, formed attheir outer ends with eyes 19, and through said eyes can be passed a pin20 attached to the frame by a chain. By removing said pin, and slidingthe door 15 to one side or the other by means of post 17, the

mill man can insert his hand into the interior of the mortar and removetherefrom chips of Wood or other foreign substances. Said opening alsoenables the inner surface of either screen to be quickly wiped ofl. Itis to be understood that the location of this 'opening is not limited tothat here shown,

but it may, if desired, be placed directly over either screen opening.

I claim In a pulverizing mill having downwardly extending channels onthe side of the mortar or pan, individual tapering 0r wedge-shapedscreen frames removably secured in said channels, each frame comprisingan apertured box to receive the screen, a gasket of flexible materialbetween said box and screen, and an apertured plate in said box oversaid screen, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

JOHN LAVAGNINO. Witnesses:

F. M. WRIGHT,

D. B. RICHARDS.

